NAME

Math::PlanePath::Base::Generic -- various path helpers

SYNOPSIS

use Math::PlanePath::Base::Generic 'round_nearest';
$x = round_nearest($x);

DESCRIPTION

This is a few generic helper functions for the PlanePath code. They're designed to work on plain Perl integers and floats and in some cases there's some special support for Math::BigInt.

EXPORTS

Nothing is exported by default but each function below can be as in the usual Exporter style,

use Math::PlanePath::Base::Generic 'round_nearest';

(But not parameter_info_nstart0() and parameter_info_nstart1(), for the reason described below.)

FUNCTIONS

Generic

$x = round_nearest ($x)

Return $x rounded to the nearest integer. If $x is half way, such as 2.5 then it's round upwards to 3.

$x = round_nearest($x);

$href = Math::PlanePath::Base::Generic::parameter_info_nstart0()

$href = Math::PlanePath::Base::Generic::parameter_info_nstart1()

Return an n_start parameter hashref suitable for use in a parameter_info_array(), with default either 0 or 1. For example,

# alone
package Math::PlanePath::MySubclass;
use constant parameter_info_array =>
  [ Math::PlanePath::Base::Generic::parameter_info_nstart1() ];

# or with other parameters too
package Math::PlanePath::MySubclass;
use constant parameter_info_array =>
  [
   { name            => 'something',
     type            => 'integer',
     default         => '123',
   },
   Math::PlanePath::Base::Generic::parameter_info_nstart1(),
  ];

This function is not exportable since it's meant for a one-off call in an initializer and so no need to import it for repeated use.

SEE ALSO

Math::PlanePath, Math::PlanePath::Base::Digits, Math::PlanePath::Base::NSEW

HOME PAGE

http://user42.tuxfamily.org/math-planepath/index.html

LICENSE

Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Kevin Ryde

This file is part of Math-PlanePath.

Math-PlanePath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Math-PlanePath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Math-PlanePath. If not, see <http://www.gnu.org/licenses/>.